tst_QMenuBar::check_shortcutPress() remove setActiveWindow()

2f6fe3a268 as made calls to
QApplicationPrivate::setActiveWindow() redundant.

Remove redundant calls.

Task-number:  QTBUG-121488
Change-Id: I569d6316f3fa7b7131ce3c8448784f0588008a2c
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

tests/auto/widgets/widgets/qmenubar/tst_qmenubar.cpp

@@ -927,7 +927,6 @@ void tst_QMenuBar::check_shortcutPress()
     const TestMenu menu = initWindowWithComplexMenuBar(w);
     w.show();
     w.setFocus();
-    QApplicationPrivate::setActiveWindow(&w);
     QVERIFY(QTest::qWaitForWindowActive(&w));
 
     QCOMPARE(m_complexTriggerCount[3], 0);